Need to find valuation from the city with Harrison Central Appraisal District.
If lot is commercial assess what would be prospective users.
If residential, look at desirability, for a 1/2 acre I would be surprised to see it sell for more than 20,000.
If you would like to sell quickly 12-15,000.
However it is hard to say without a pic of the exact property.
Hope this helps.... more